CN112140941A - Vehicle mode switching method, device, equipment and storage medium - Google Patents

Vehicle mode switching method, device, equipment and storage medium Download PDF

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Publication number
CN112140941A
CN112140941A CN202011003252.1A CN202011003252A CN112140941A CN 112140941 A CN112140941 A CN 112140941A CN 202011003252 A CN202011003252 A CN 202011003252A CN 112140941 A CN112140941 A CN 112140941A
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China
Prior art keywords
battery
state
main battery
temperature
main
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CN202011003252.1A
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CN112140941B (en
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霍云龙
王燕
刘建康
杨钫
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FAW Group Corp
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FAW Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a mode switching method, a mode switching device, mode switching equipment and a storage medium. The method comprises the following steps: acquiring the state of the main battery and the state of the auxiliary battery; and switching modes according to the main battery state and the auxiliary battery state. According to the technical scheme, the auxiliary battery is preferentially used for driving and recovering in a low-temperature environment by utilizing the characteristics of small size, less energy and quick temperature rise of the auxiliary battery, so that the recovery of braking energy can be increased to a certain extent, and the driving range in winter is effectively prolonged.

Description

Vehicle mode switching method, device, equipment and storage medium
Technical Field
The embodiment of the invention relates to vehicle technology, in particular to a mode switching method, device, equipment and storage medium.
Background
Under severe cold conditions in winter, the performance and the discharge capacity of the vehicle power battery are greatly attenuated, and in addition, the warm air use and the resistance of the vehicle are increased in winter, so that the driving range is greatly shortened. The charging power of the battery is reduced at low temperature, even the battery is hardly recovered, so that the recovery of the braking energy is greatly reduced, the charging power is an important factor influencing the driving range, and the charging power is a common problem faced by the pure electric vehicle at present. At present, a method for heating a battery at low temperature is generally adopted, but the heat capacity of the battery is large, the temperature rise rate is slow, the energy recovery capability of the battery cannot be met in the temperature rise process, and a large amount of recoverable energy is not fully utilized.
Disclosure of Invention
Embodiments of the present invention provide a mode switching method, apparatus, device, and storage medium, so as to increase braking energy recovery to a certain extent and effectively extend a driving range in winter.
In a first aspect, an embodiment of the present invention provides a mode switching method, applied to a vehicle, where the vehicle includes a main battery and an auxiliary battery, where the main battery and the auxiliary battery are connected in parallel, and the mode switching method includes:
acquiring the main battery state and the auxiliary battery state, wherein the main battery state comprises: main battery temperature;
and switching modes according to the main battery state and the auxiliary battery state.
Further, the main battery state further includes: at least one of a main battery fault state and a main battery normal state, the auxiliary battery state including: at least one of a secondary battery temperature, a secondary battery state of charge value, a secondary battery fault state, and a secondary battery normal state.
Further, performing mode switching according to the main battery state and the sub battery state includes:
if the temperature of the main battery is larger than or equal to a first temperature threshold, switching to a main battery independent driving mode, and switching the main battery independent driving mode to a main and auxiliary battery combined driving mode until the state of charge value of the main battery is smaller than a first state of charge threshold;
if the temperature of the main battery is smaller than the first temperature threshold value and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold value, switching to a main battery independent driving mode;
if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is larger than or equal to the third state of charge threshold, switching to an auxiliary battery independent driving mode;
and if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode.
Further, the method also comprises the following steps:
when the vehicle is in a sub-battery single driving mode, if the temperature of the sub-battery is smaller than a second temperature threshold value, heating the sub-battery;
if the temperature of the auxiliary battery is greater than or equal to the second temperature threshold value, stopping heating the auxiliary battery;
stopping heating the secondary battery when the vehicle exits the secondary battery individual drive mode.
Further, the method also comprises the following steps:
when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode;
when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery independent driving mode, if the main battery state of charge value is larger than a first state of charge threshold, the main battery temperature is larger than a first temperature threshold, and the main battery state is a normal state, switching to the main battery independent driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the charge state value of the auxiliary battery is smaller than the second charge state threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in a main and auxiliary battery combined driving mode and the state of charge value of the auxiliary battery is smaller than the second state of charge threshold value, switching to a main battery independent driving mode;
and when the vehicle is in a main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main battery independent driving mode.
Further, the method also comprises the following steps: a first relay and a second relay;
correspondingly, if the main battery temperature is greater than or equal to the first temperature threshold, switching to the main battery individual driving mode includes:
if the temperature of the main battery is greater than or equal to a first temperature threshold value, acquiring the state of the second relay;
if the second relay is in an open state, controlling the first relay to be closed so as to enable the vehicle to be switched to a main battery independent driving mode;
and if the second relay is in a closed state, controlling the first relay to be closed, and controlling the second relay to be opened after preset time so as to enable the vehicle to be switched to a main battery independent driving mode.
In a second aspect, an embodiment of the present invention further provides a mode switching apparatus, where the apparatus includes:
an obtaining module, configured to obtain the main battery state and the auxiliary battery state, where the main battery state includes: main battery temperature;
and the switching module is used for switching modes according to the main battery state and the auxiliary battery state.
Further, the main battery state further includes: at least one of a main battery fault state and a main battery normal state, the auxiliary battery state including: at least one of a secondary battery temperature, a secondary battery state of charge value, a secondary battery fault state, and a secondary battery normal state.
Further, the switching module is specifically configured to:
if the temperature of the main battery is larger than or equal to a first temperature threshold, switching to a main battery independent driving mode, and switching the main battery independent driving mode to a main and auxiliary battery combined driving mode until the state of charge value of the main battery is smaller than a first state of charge threshold;
if the temperature of the main battery is smaller than the first temperature threshold value and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold value, switching to a main battery independent driving mode;
if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is larger than or equal to the third state of charge threshold, switching to an auxiliary battery independent driving mode;
and if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode.
Further, the switching module is specifically configured to:
when the vehicle is in a sub-battery single driving mode, if the temperature of the sub-battery is smaller than a second temperature threshold value, heating the sub-battery;
if the temperature of the auxiliary battery is greater than or equal to the second temperature threshold value, stopping heating the auxiliary battery;
stopping heating the secondary battery when the vehicle exits the secondary battery individual drive mode.
Further, the switching module is specifically configured to:
when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode;
when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery independent driving mode, if the main battery state of charge value is larger than a first state of charge threshold, the main battery temperature is larger than a first temperature threshold, and the main battery state is a normal state, switching to the main battery independent driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the charge state value of the auxiliary battery is smaller than the second charge state threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in a main and auxiliary battery combined driving mode and the state of charge value of the auxiliary battery is smaller than the second state of charge threshold value, switching to a main battery independent driving mode;
and when the vehicle is in a main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main battery independent driving mode.
Further, the method also comprises the following steps: a first relay and a second relay;
correspondingly, further, the switching module is specifically configured to:
if the temperature of the main battery is greater than or equal to a first temperature threshold value, acquiring the state of the second relay;
if the second relay is in an open state, controlling the first relay to be closed so as to enable the vehicle to be switched to a main battery independent driving mode;
and if the second relay is in a closed state, controlling the first relay to be closed, and controlling the second relay to be opened after preset time so as to enable the vehicle to be switched to a main battery independent driving mode.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the mode switching method according to any one of the embodiments of the present invention.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the mode switching method according to any one of the embodiments of the present invention.
According to the embodiment of the invention, the main battery state and the auxiliary battery state are obtained, wherein the main battery state comprises the following steps: main battery temperature; and mode switching is carried out according to the state of the main battery and the state of the auxiliary battery, and the auxiliary battery is preferentially used for driving and recovering in a low-temperature environment by utilizing the characteristics of small size, less energy and quick temperature rise of the auxiliary battery, so that the recovery of the braking energy can be increased to a certain extent, and the driving range in winter is effectively prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a mode switching method according to a first embodiment of the present invention;
FIG. 1a is an electrical schematic diagram of a first embodiment of the present invention;
FIG. 1b is a schematic diagram of a battery heating scheme according to a first embodiment of the present invention;
FIG. 1c is a flow chart of another mode switching method according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mode switching apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a computer device in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example one
Fig. 1 is a flowchart of a mode switching method provided in an embodiment of the present invention, where the embodiment is applicable to a situation of switching a battery power supply mode of a vehicle, and the method may be executed by a mode switching device in an embodiment of the present invention, where the mode switching device may be implemented in a software and/or hardware manner, as shown in fig. 1, the method specifically includes the following steps:
s110, obtaining the main battery state and the auxiliary battery state, where the main battery state includes: the main battery temperature.
Wherein the main battery state may include a main battery temperature, and may also include: main battery temperature and main battery fault status, or may include: the main battery temperature and the main battery normal state may also include states of a relay corresponding to the main battery temperature and the main battery, where the relay state may be an open state or a closed state, where the main battery fault state and the main battery normal state may only include one of them, and the sub-battery state may include: the secondary battery temperature may also include the secondary battery state of charge value, and may further include: the relay state corresponding to the sub-battery may include: the sub-battery fault state or the sub-battery normal state may include only one of the sub-battery fault state and the sub-battery normal state.
Specifically, a main battery state and the sub battery state are acquired.
And S120, switching modes according to the main battery state and the auxiliary battery state.
The mode switching may be switching from the main battery individual driving mode to the main-auxiliary battery combined driving mode, switching to the main battery individual driving mode after the vehicle is started, switching from the auxiliary battery individual driving mode to the main-auxiliary battery combined driving mode, or switching from the auxiliary battery individual driving mode to the main battery individual driving mode, which is not limited in this embodiment of the present invention.
For example, the mode switching according to the state of the main battery and the state of the auxiliary battery may be to switch to the main battery individual driving mode if the temperature of the main battery is greater than or equal to a first temperature threshold, and switch the main battery individual driving mode to the main-auxiliary battery joint driving mode until the state of charge value of the main battery is less than a first state of charge threshold; or if the temperature of the main battery is smaller than the first temperature threshold and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold, switching to a main battery independent driving mode; if the temperature of the main battery is lower than the first temperature threshold, the state of charge value of the auxiliary battery is greater than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is greater than or equal to the third state of charge threshold, switching to a main battery independent driving mode; or if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is greater than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode; when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode; when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery individual driving mode, if the main battery state of charge value is greater than a first state of charge threshold, the main battery temperature is greater than a first temperature threshold, and the main battery state is a normal state, switching to the main battery individual driving mode; or, when the vehicle is in a secondary battery independent driving mode and the secondary battery state of charge value is smaller than the second state of charge threshold value, switching to a primary and secondary battery combined driving mode; when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode; or, when the vehicle is in a main-auxiliary battery combined driving mode and the auxiliary battery state of charge value is smaller than the second state of charge threshold, switching to a main battery individual driving mode; the method can also be used for switching to the main battery independent driving mode when the vehicle is in the main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value. The embodiments of the present invention are not limited in this regard.
Optionally, the main battery state further includes: at least one of a main battery fault state and a main battery normal state, the auxiliary battery state including: at least one of a secondary battery temperature, a secondary battery state of charge value, a secondary battery fault state, and a secondary battery normal state.
Optionally, performing mode switching according to the main battery state and the auxiliary battery state includes:
if the temperature of the main battery is larger than or equal to a first temperature threshold, switching to a main battery independent driving mode, and switching the main battery independent driving mode to a main and auxiliary battery combined driving mode until the state of charge value of the main battery is smaller than a first state of charge threshold;
if the temperature of the main battery is smaller than the first temperature threshold value and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold value, switching to a main battery independent driving mode;
if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is larger than or equal to the third state of charge threshold, switching to an auxiliary battery independent driving mode;
and if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode.
The first state of charge threshold is a set lower threshold, which may be set by a user or a system, and this is not limited in the embodiment of the present invention.
The first temperature threshold may be set by a user or a system, which is not limited in this embodiment of the present invention. The third state of charge threshold is greater than the second state of charge threshold, for example, the second state of charge threshold may be 5%, and the third state of charge threshold may be 15%.
Optionally, the method further includes:
when the vehicle is in a sub-battery single driving mode, if the temperature of the sub-battery is smaller than a second temperature threshold value, heating the sub-battery;
if the temperature of the auxiliary battery is greater than or equal to the second temperature threshold value, stopping heating the auxiliary battery;
stopping heating the secondary battery when the vehicle exits the secondary battery individual drive mode.
The second temperature threshold may be set by a user or a system, which is not limited in this embodiment of the present invention.
Optionally, the method further includes:
when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode;
when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery independent driving mode, if the main battery state of charge value is larger than a first state of charge threshold, the main battery temperature is larger than a first temperature threshold, and the main battery state is a normal state, switching to the main battery independent driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the charge state value of the auxiliary battery is smaller than the second charge state threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in a main and auxiliary battery combined driving mode and the state of charge value of the auxiliary battery is smaller than the second state of charge threshold value, switching to a main battery independent driving mode;
and when the vehicle is in a main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main battery independent driving mode.
Optionally, the method further includes: a first relay and a second relay;
correspondingly, if the main battery temperature is greater than or equal to the first temperature threshold, switching to the main battery individual driving mode includes:
if the temperature of the main battery is greater than or equal to a first temperature threshold value, acquiring the state of the second relay;
if the second relay is in an open state, controlling the first relay to be closed so as to enable the vehicle to be switched to a main battery independent driving mode;
and if the second relay is in a closed state, controlling the first relay to be closed, and controlling the second relay to be opened after preset time so as to enable the vehicle to be switched to a main battery independent driving mode.
Optionally, the method further includes:
if the temperature of the main battery is smaller than the first temperature threshold value and the temperature of the main battery is smaller than the water temperature of a motor cooling system, heating the main battery;
stopping heating the main battery when the main battery temperature is greater than or equal to a first temperature threshold;
when the vehicle stops and the high-voltage system is powered off, heating of the main battery is stopped;
and when the temperature of the main battery is greater than or equal to the water temperature of the motor cooling system, stopping heating the main battery.
In an example, the system operating principle provided by the embodiment of the present invention is mainly that in a low temperature environment, since the temperature of the secondary battery rises rapidly, the secondary battery is preferentially used for discharging and recovering during each driving, meanwhile, the motor waste heat is used for heating the main battery, and the main battery is switched to discharge and recover after the temperature of the main battery rises, so that the energy recovery rate at the low temperature is always kept at a higher level. The configuration principle (electrical principle) is shown in fig. 1a, and the main battery and the auxiliary battery are connected in parallel. Can work alone or in combination. The battery heating scheme is as shown in fig. 1b, the motor loop can heat the main battery but cannot heat the auxiliary battery, and the auxiliary battery adopts a thin film resistor or a heating mode not limited to the thin film resistor, and can quickly heat the auxiliary battery to be raised to a proper temperature. The switching of the main and auxiliary batteries and the heating control of the main and auxiliary batteries are controlled by a controller.
In another example, as shown in FIG. 1c, the main battery drives:
working condition 1: when the vehicle is started at any environmental temperature, when the temperature of the main battery is monitored to be higher than T1, the main battery relay 1 is closed, the auxiliary battery relay 2 is opened, the high-voltage loop is not connected, and the main battery participates in all discharging and recycling charging. And when the SOC of the main battery is lower than the set lower limit SOC0, the auxiliary battery vehicle is driven in an intervening mode, exits from the main battery independent driving mode and adopts a combined driving mode.
Working condition 2: when the vehicle is started in a low-temperature environment, when the temperature of the main battery is monitored to be lower than T1 and the SOC of the auxiliary battery is judged to be lower than SOC1 (such as 5%), the main battery relay 1 is closed, the auxiliary battery relay 2 is opened and is not connected to a high-voltage loop, and the main battery participates in all discharging and recycling charging.
Working condition 3: when the vehicle is started at any environmental temperature, the auxiliary battery reports the battery fault, and when the high-voltage safety is not influenced, the main battery is driven independently.
Working condition 4: in the driving process, the driving mode can be in a main battery and auxiliary battery combined driving state or an auxiliary battery independent driving state, and when the following three conditions are met simultaneously, the driving mode is also switched to a main battery independent driving mode:
(1) main battery SOC > SOC 0; (2) main battery temperature is higher than T1; (3) the main battery is not in failure.
The main battery driving mode is mainly used for driving a vehicle when the temperature of the main battery is high and the recovery capability of the braking energy can meet the recovery requirement, namely when the temperature of the main battery is high, the single main battery driving mode is preferentially used.
The auxiliary battery drives:
when the vehicle is started in a low-temperature environment, when the temperature of the main battery is monitored to be lower than T1, and when the SOC of the auxiliary battery is judged to be higher than SOC1 (such as 5%) and higher than SOC2 (such as 15%), the relay 2 corresponding to the auxiliary battery is closed, the main battery relay 1 is opened, the high-voltage loop is not accessed, and the auxiliary battery participates in all discharging and recycling charging. The sub-battery SOC and the main battery temperature are always detected during traveling.
When one of the following two conditions occurs, the main battery is driven by the power system, the auxiliary battery independent driving mode is exited, and the two batteries participate in charging and discharging work at the same time: (1) sub-battery SOC < SOC 1; (2) when the main battery temperature reaches T1. When the temperature of the main battery reaches T1, the main battery relay 1 is closed, the main battery is connected into the system, and the auxiliary battery is withdrawn after the main battery is driven for 60 s. When the sub-battery SOC reaches the lower limit value SOC1, the sub-battery starts to prepare for the withdrawal operation, and the withdrawal process is the same as the above-described withdrawal process.
Wherein SOC1 should be set lower than SOC2, SOC1 is set to prevent the sub-battery from over-discharging, which affects battery life; the SOC2 is set in such a way that the discharge power of the auxiliary battery may not guarantee the dynamic demand of a driver, the main battery is required to be involved in driving together, good dynamic performance of the vehicle is guaranteed, the SOC value of the discharge power demand of the battery with the vehicle speed reaching V1 (such as 60km/h) can be met, and the SOC value is above the SOC value, so that the auxiliary battery can be considered to provide enough power support.
A combined driving mode:
working condition 1: when a vehicle is started in a low-temperature environment, when the temperature of a main battery is monitored to be lower than T1, when the SOC of an auxiliary battery is judged to be higher than SOC1 (such as 5%) and lower than SOC2 (such as 15%), a relay 2 corresponding to the auxiliary battery is closed, the main battery relay 2 is closed, a combined driving mode is entered, and meanwhile, the battery 1 is heated until any one of the following conditions is met (1) the SOC of the auxiliary battery is less than SOC 1; (2) when the temperature of the main battery reaches T1, the auxiliary battery is ready to exit in the same manner as described above.
Working condition 2: in any main and auxiliary battery switching process, there is a short joint drive, and the time is 60s of the auxiliary battery or main battery exit process.
Working condition 3: under the non-low temperature working condition, the main battery and the auxiliary battery are always in a parallel combined driving state, and a mode that a certain battery is driven independently can be entered unless any power battery system fails or the SOC of any power battery system is too low.
When the vehicle is started at a low temperature next time, the above steps are repeated, and the sub-battery is preferentially used.
Control strategy for heating of primary and secondary batteries
1. The auxiliary battery heating strategy is as follows:
the sub-battery adopts a thin film resistor or a heating method not limited to the thin film resistor. When the temperature of the auxiliary battery is lower than T2, the auxiliary battery is heated by using a thin film resistor, and the temperature value of the auxiliary battery is recorded. The auxiliary battery has small capacity and heat capacity, and is fast in temperature rise due to frequent charging and discharging during running, so that the braking energy recovery rate is favorably improved.
Heating begins when the following two conditions are simultaneously met: 1. the sub-battery temperature is lower than T2; 2. the system is in an auxiliary battery independent driving mode; when any one of the following conditions is met, the heating is quitted: 1. the sub-battery temperature is higher than T2; 2. the system exits the auxiliary battery independent driving mode; 3. the vehicle stops and the high-voltage system is powered down.
2. Main battery heating strategy:
the main battery adopts a water cooling mode, and when the following two conditions are simultaneously met, heating is started: 1. main battery temperature is below T1; 2. the temperature of the main battery is lower than the water temperature of a motor cooling system; when the main battery simultaneously meets any one of the following conditions, the heating is exited: 1. main battery temperature is higher than T1; 2. the vehicle stops, and the high-voltage system is powered off; 3. the temperature of the main battery is higher than the water temperature of the motor cooling system. Even if the main battery 1 exits the driving mode, the waste heat of the motor cooling system can be used for heating the main battery, so that the energy of a vehicle is not wasted, the temperature of the main battery is kept, the preparation is advanced for the driving of the main battery and the subsequent combined driving, and the service life of the battery in the working process is prolonged.
When the main battery is heated, as shown in fig. 1b, the four-way valve 1 is turned on by the controller, the main battery cooling water path is heated by the waste heat of the motor cooling water path, and the temperature value of the main battery is recorded.
The embodiment of the invention mainly aims at the problem that the driving range of a pure electric automobile is short in a low-temperature environment. The power system provided by the embodiment of the invention adopts a double-battery parallel power system, and uses the temperature as a control variable to realize the switching of the use of the main battery and the auxiliary battery. Compared with the auxiliary battery, the main battery has small volume, less energy and quicker temperature rise, is preferentially used in a low-temperature environment, can increase the recovery of braking energy to a certain extent by the mode switching of the system and the battery heating control method, and effectively prolongs the driving range in winter. The prior art has not proposed a mode switching method considering improving the low-temperature energy recovery performance.
According to the technical scheme of the embodiment, the state of the main battery and the state of the auxiliary battery are obtained; and mode switching is carried out according to the state of the main battery and the state of the auxiliary battery, and the characteristics of small volume, less energy and quick temperature rise of the auxiliary battery are utilized, so that the auxiliary battery is preferentially used for driving and recovering in a low-temperature environment to realize that the recovery of the braking energy can be increased to a certain extent, and the driving range in winter is effectively prolonged.
Example two
Fig. 2 is a schematic structural diagram of a mode switching device according to a second embodiment of the present invention. The present embodiment may be applicable to the case of vehicle power supply mode switching, the apparatus may be implemented in a software and/or hardware manner, and the apparatus may be integrated in any device providing a mode switching function, as shown in fig. 2, where the mode switching apparatus specifically includes: an acquisition module 210 and a switching module 220.
The obtaining module is configured to obtain the main battery state and the auxiliary battery state, where the main battery state includes: main battery temperature;
and the switching module is used for switching modes according to the main battery state and the auxiliary battery state.
Optionally, the main battery state further includes: at least one of a main battery fault state and a main battery normal state, the auxiliary battery state including: at least one of a secondary battery temperature, a secondary battery state of charge value, a secondary battery fault state, and a secondary battery normal state.
Optionally, the switching module is specifically configured to:
if the temperature of the main battery is larger than or equal to a first temperature threshold, switching to a main battery independent driving mode, and switching the main battery independent driving mode to a main and auxiliary battery combined driving mode until the state of charge value of the main battery is smaller than a first state of charge threshold;
if the temperature of the main battery is smaller than the first temperature threshold value and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold value, switching to a main battery independent driving mode;
if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is larger than or equal to the third state of charge threshold, switching to an auxiliary battery independent driving mode;
and if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode.
Optionally, the switching module is specifically configured to:
when the vehicle is in a sub-battery single driving mode, if the temperature of the sub-battery is smaller than a second temperature threshold value, heating the sub-battery;
if the temperature of the auxiliary battery is greater than or equal to the second temperature threshold value, stopping heating the auxiliary battery;
stopping heating the secondary battery when the vehicle exits the secondary battery individual drive mode.
Optionally, the switching module is specifically configured to:
when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode;
when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery independent driving mode, if the main battery state of charge value is larger than a first state of charge threshold, the main battery temperature is larger than a first temperature threshold, and the main battery state is a normal state, switching to the main battery independent driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the charge state value of the auxiliary battery is smaller than the second charge state threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in a main and auxiliary battery combined driving mode and the state of charge value of the auxiliary battery is smaller than the second state of charge threshold value, switching to a main battery independent driving mode;
and when the vehicle is in a main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main battery independent driving mode.
Optionally, the method further includes: a first relay and a second relay;
correspondingly, optionally, the switching module is specifically configured to:
if the temperature of the main battery is greater than or equal to a first temperature threshold value, acquiring the state of the second relay;
if the second relay is in an open state, controlling the first relay to be closed so as to enable the vehicle to be switched to a main battery independent driving mode;
and if the second relay is in a closed state, controlling the first relay to be closed, and controlling the second relay to be opened after preset time so as to enable the vehicle to be switched to a main battery independent driving mode.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
In the technical solution of this embodiment, the main battery state and the auxiliary battery state are obtained, where the main battery state includes: main battery temperature; and mode switching is carried out according to the state of the main battery and the state of the auxiliary battery, and the auxiliary battery is preferentially used for driving and recovering in a low-temperature environment by utilizing the characteristics of small size, less energy and quick temperature rise of the auxiliary battery, so that the recovery of the braking energy can be increased to a certain extent, and the driving range in winter is effectively prolonged.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a computer device in a third embodiment of the present invention. FIG. 3 illustrates a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention. The computer device 12 shown in FIG. 3 is only an example and should not impose any limitation on the scope of use or functionality of embodiments of the present invention.
As shown in FIG. 3, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, an enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system Memory 28 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 30 and/or cache Memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 3, and commonly referred to as a "hard drive"). Although not shown in FIG. 3, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (a Compact disk-Read Only Memory (CD-ROM)), Digital Video disk (DVD-ROM), or other optical media may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with computer device 12, and/or with any devices (e.g., network card, modem, etc.) that enable computer device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. In the computer device 12 of the present embodiment, the display 24 is not provided as a separate body but is embedded in the mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. Moreover, computer device 12 may also communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN)) and/or a public Network (e.g., the Internet) via Network adapter 20. As shown, network adapter 20 communicates with the other modules of computer device 12 via bus 18. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, Redundant processing units, external disk drive Arrays, disk array (RAID) systems, tape drives, and data backup storage systems, to name a few.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing a mode switching method provided by an embodiment of the present invention:
acquiring the main battery state and the auxiliary battery state, wherein the main battery state comprises: main battery temperature;
and switching modes according to the main battery state and the auxiliary battery state.
Example four
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the mode switching method provided in all the embodiments of the present invention of the present application:
acquiring the main battery state and the auxiliary battery state, wherein the main battery state comprises: main battery temperature;
and switching modes according to the main battery state and the auxiliary battery state.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (HyperText Transfer Protocol), and may interconnect with any form or medium of digital data communication (e.g., a communications network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.
The computer readable medium may be embodied in the electronic device; or may exist separately without being assembled into the electronic device.
The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: receiving a source text input by a user, and translating the source text into a target text corresponding to a target language; acquiring historical correction behaviors of the user; and correcting the target text according to the historical correction behaviors to obtain a translation result, and pushing the translation result to a client where the user is located.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Where the name of an element does not in some cases constitute a limitation on the element itself.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A mode switching method is applied to a vehicle, wherein the vehicle comprises a main battery and an auxiliary battery, wherein the main battery and the auxiliary battery are connected in parallel, and the mode switching method comprises the following steps:
acquiring a main battery state and an auxiliary battery state, wherein the main battery state comprises: main battery temperature;
and switching modes according to the main battery state and the auxiliary battery state.
2. The method according to claim 1, wherein the main battery state further comprises: at least one of a main battery fault state and a main battery normal state, the auxiliary battery state including: at least one of a secondary battery temperature, a secondary battery state of charge value, a secondary battery fault state, and a secondary battery normal state.
3. The method according to claim 2, wherein performing mode switching according to the main battery state and the sub-battery state comprises:
if the temperature of the main battery is larger than or equal to a first temperature threshold, switching to a main battery independent driving mode, and switching the main battery independent driving mode to a main and auxiliary battery combined driving mode until the state of charge value of the main battery is smaller than a first state of charge threshold;
if the temperature of the main battery is smaller than the first temperature threshold value and the state of charge value of the auxiliary battery is smaller than a second state of charge threshold value, switching to a main battery independent driving mode;
if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is larger than or equal to the third state of charge threshold, switching to an auxiliary battery independent driving mode;
and if the temperature of the main battery is smaller than the first temperature threshold, the state of charge value of the auxiliary battery is larger than or equal to the second state of charge threshold, and the state of charge value of the auxiliary battery is smaller than the third state of charge threshold, switching to a main-auxiliary battery combined driving mode.
4. The method of claim 3, further comprising:
when the vehicle is in a sub-battery single driving mode, if the temperature of the sub-battery is smaller than a second temperature threshold value, heating the sub-battery;
if the temperature of the auxiliary battery is greater than or equal to the second temperature threshold value, stopping heating the auxiliary battery;
stopping heating the secondary battery when the vehicle exits the secondary battery individual drive mode.
5. The method of claim 3, further comprising:
when the auxiliary battery reports a battery fault and the vehicle is in a high-voltage safety state, switching to a main battery independent driving mode;
when the vehicle is in a main-auxiliary battery combined driving mode or an auxiliary battery independent driving mode, if the main battery state of charge value is larger than a first state of charge threshold, the main battery temperature is larger than a first temperature threshold, and the main battery state is a normal state, switching to the main battery independent driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the charge state value of the auxiliary battery is smaller than the second charge state threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in an auxiliary battery independent driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main and auxiliary battery combined driving mode;
when the vehicle is in a main and auxiliary battery combined driving mode and the state of charge value of the auxiliary battery is smaller than the second state of charge threshold value, switching to a main battery independent driving mode;
and when the vehicle is in a main and auxiliary battery combined driving mode and the temperature of the main battery is greater than the first temperature threshold value, switching to a main battery independent driving mode.
6. The method of claim 3, further comprising: a first relay and a second relay;
correspondingly, if the main battery temperature is greater than or equal to the first temperature threshold, switching to the main battery individual driving mode includes:
if the temperature of the main battery is greater than or equal to a first temperature threshold value, acquiring the state of the second relay;
if the second relay is in an open state, controlling the first relay to be closed so as to enable the vehicle to be switched to a main battery independent driving mode;
and if the second relay is in a closed state, controlling the first relay to be closed, and controlling the second relay to be opened after preset time so as to enable the vehicle to be switched to a main battery independent driving mode.
7. The method of claim 3, further comprising:
if the temperature of the main battery is smaller than the first temperature threshold value and the temperature of the main battery is smaller than the water temperature of a motor cooling system, heating the main battery;
stopping heating the main battery when the main battery temperature is greater than or equal to a first temperature threshold;
when the vehicle stops and the high-voltage system is powered off, heating of the main battery is stopped;
and when the temperature of the main battery is greater than or equal to the water temperature of the motor cooling system, stopping heating the main battery.
8. A mode switching apparatus, characterized in that the mode switching apparatus comprises:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a main battery state and an auxiliary battery state, and the main battery state comprises: main battery temperature;
and the switching module is used for switching modes according to the main battery state and the auxiliary battery state.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the mode switching method according to any one of claims 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the mode switching method according to any one of claims 1 to 7.
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